Travel 1st class then!
That is simply an selfish/ ignorant attitude!
I don't think it is selfish.
At times I feel like I must have magnetic power to attract people to come and irritate me, it's not unreasonable to expect to have an undisturbed and spacious journey when a train is relatively empty (I'm thinking 50% loaded or less).
And, as I'm sure you well know, not all services or trains convey 1st class accommodation!
Also, I don't see it's unreasonable to expect a little personal space and be unhappy when it's taken by late-boarders who can't be bothered to walk down the platform to a part of the train which is empty, though having said that I tend to take advantage of this by attempting to choose the part of the train I hope might be quietest.
It's one thing on busy trains, but on those where there is plenty of space it's just good manners to spread out. You wouldn't turn up in an empty field and pitch a tent inches from someone already established, and it's good manners for the same to apply on trains.
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Bags are annoying, irritating and should go in the spaces provided.
Don't get me started with feet on seats............
How can a bag be annoying or irritating? I can think of plenty of passenger behaviours which can be considered annoying or irritating though - the list is endless. Like most things in life, unfortunately the majority are quite capable of travelling by train without causing annoyance or irritation, but it's the small minority which stand out, sadly.